Merge pull request #7 from triplem/master

Adopt osmanager, add build targets
Reworked OSManager.getFilePath because for Plugins the new method was only returning:
/C:/Keep/git/repository/MediaPlayer/com.upnp.mediaplayer/bin

Added method to Utils class with execute and containsString methods to remove dependency on Pi4J.
Added the images directory back into the .jar
Start of LIRC integration Plugin, proof of concept to see if we can invoke LIRC from the command line. At the moment only works for VolumeInc and VolumeDec events
Migrate whole project to maven to make it easier to contribute and to understand the structure of the project
Add zip-file construction
Rework resources directory
Another step to use maven as central build architecture
Remove plugin jars
Minor adoptions on the pom versioning